/*
 * Copyright 2016-2019 yoara
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package yhao.infra.apilist.validate.decimalrange;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.math.BigDecimal;

/**
 * 校验给定的数字是否在指定精度内
 * <p>这同时是一个实现验证架构的参考
 *
 * @see DecimalRange
 * @author yoara
 */
public class DecimalValidator implements ConstraintValidator<DecimalRange,BigDecimal> {
    private BigDecimal min;
    private BigDecimal max;
    private int scale;
    private boolean needCheck;
    @Override
    public void initialize(DecimalRange constraintAnnotation) {
        min = BigDecimal.valueOf(constraintAnnotation.min());
        max = BigDecimal.valueOf(constraintAnnotation.max());
        scale = constraintAnnotation.scale();
        needCheck = constraintAnnotation.needCheck();
    }

    @Override
    public boolean isValid(BigDecimal value, ConstraintValidatorContext context) {
        if(needCheck){
            if(value == null){
                return false;
            }

            int valueScale = value.scale();
            if(valueScale> scale){
                return false;
            }

            if(value.subtract(min).doubleValue()<0 || value.subtract(max).doubleValue()>0){
                return false;
            }
        }
        return true;
    }
}

